Most athletes at one point or another hit a rough patch where performance falls short, even when they’re giving it everything they’ve got in the gym. However, many brush it off as just another bad workout.

Chronic fatigue and loss of drive could point to serious health concerns linked to nutrient deficiencies.

Instead of grinding harder, it’s smarter to pause and take a hard look at your nutrition.

As a personal trainer with over 17 years in the trenches, I’ve firsthand seen how vitamin D deficiency can wreck your energy and recovery. I’ve been there myself, and things got so severe it took medical intervention to bounce back.

In this article, I break down everything you need to know about vitamin D, including what it is, why you might be deficient, how to test your levels, and what yo

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